SU1394355A1 - Square pulse driver - Google Patents

Abstract

The invention relates to electrical engineering and can be used in pulsed voltage converters. The purpose of the invention is to increase the reliability of a square pulse shaper. If, as a result of a random failure, the information signal in the control channel from the main thyristor 2 disappears, then at a certain point of time the element 22 becomes open for the triggering signal to the input of the generator 23, which leads to the switching of the switching thyristor through the additional channel . In this case, the system as a whole remains operable. If a malfunction occurs in the pulse mode of the driver, which is caused by the fact that the main thyristor 2 is not turned off, an element 21 will be open at a certain point in time, which leads to the appearance of a non-switching signal thyristor 2 and subsequent emergency stopping of the driver. Similarly to the considered element, And 21 turns out to be open even if the failure in the pulsed mode of operation of the imaging device is connected with the non-switching on of the switching thyristor 7, but already due to the internal features of the thyristor itself, for example, short circuit due to damage like the breakage 2 Il. with (/) . iSfOfwoOnu ki CO 1 O9 cl SP

Description

The invention relates to electrical engineering. Io can be used in formers of square impulses, as well as in impulse transforms of voltage bodies

The purpose of the invention is to increase the reliability of the rectangular pulse former.

Fig. 1 shows a schematic of a square pulse shaper; Fig. 2 shows timing charts explaining the operation of the device.

A square pulse shaper (FIG.) Consists of a source of constant voltage 1, a main thyristor 2, shunted by a reverse diode 3, connected in series with the specified voltage source 1 and a load 4, and a switching node connected in parallel with the load and from the serial LC circuit 5.6 and switching thyristor 7 connected in series with the specified LC circuit and shunted by a reverse diode 8, and parallel to the main and switching thyristors through current-limiting drives Stops 9 and 10 are connected to radiating diodes 11 and 12, photodetectors 13 and 14 of which are connected to the inputs of delay elements 15 and 16, the outputs of which are connected to the input circuits of the formers 1 7 and 18 of the control pulses of the main and switching thyristors, as well as 19 and 20 delays, the outputs of which are connected to the first inputs of And 21 and 22, the second inputs of which receive a signal from (the optocoupler receiver connected to the switching thyristor, and the output of the And 22 element momentum control switching thyristor 7 o This signal also carries information about the malfunction of this thyristor, and from the output of another element I 21 the information signal about the failure of the main thyristor 2 "

In Fig. 2, the following notation is accepted:

1 - load current;

Akl anode – cathode thyristor 2 voltage;

, - voltage of anode-cathode of thyristor 7;

ILJ - inductance current 5;

five

5 0 5 0 5

to is the moment when the control pulse is applied to the main thyristor 2; t is the delay time determined by

element 15; t., is the delay time determined by

element 16; t ,,, is the delay time determined by

element 19; tj, is the delay time determined by

element 20 „

The device works as follows.

Let the main thyriator 2 of the imaging device turn on and a rectangular voltage pulse is generated on the load 4 As a result of switching on the thyristor 2, the optocoupler LED 11, connected in parallel to the thyristor 2o, ceases to emit, and the optocoupler 13 receives radiation from the LED 11 and after some time (approximately equal to pulse duration at the load 4), determined by the delay element 15, the data signal starts the driver

17 control pulses, the output of which sends a signal to unlock the switching thyristor 7 The thyristor 7 is unlocked and, due to the oscillatory process in the LC circuit 5,6, it turns off the main thyristor 2 o As a result of turning on the thyristor 7, the optocoupler 12 is disconnected, connected in parallel to the switch thyristor

7 o The photodetector 14 of the optocouplers receives this signal about the state of the thyristor 7, and after a time interval determined by the delay element 16, this signal starts the driver

18 control pulse, from the output of which a trigger pulse arrives at the main thyristor 2 of the driver. The process is then repeated, ensuring synchronism in the operation of the driver control system. If the system functions without failures, then on the input of the corresponding elements, And 21 and 22 signals correspond to the logical O, i.e. combinations 00 indicate normal operation. For diagnosing emergency situations in the system, as well as dp. restarting the switching node, the shaper is supplied with delay elements 19 and 20, which shift the information signal about the state of power thyristors 2 and 7 for a certain time interval, respectively. The signals from the photodetector 14 are transmitted on state of the switching thyristor 7 o If as a result of some random failure the information signal disappears in the canape of ul. from the main thyristor 2 (which consequently leads to the non-switching on of the switching thyristor 7), then at time t t 34 the element And 22 is open for dl. passing the triggering signal to the input of the imager 23, which leads to switching on the switching thyristor through the additional channel. in case of a random (single) malfunction of the switching node, an additional signal is provided to the switching thyristor, which does not stop the operation of the entire system

Claims (1)

Invention Formula A square pulse shaper containing a constant voltage source connected through the main thyristor, shunted by the first reverse diode, to the terminals for In general, it maintains the operability of the load connection connected to the switching node, made in the form of series-connected throttles, of a capacitor and a commutating .ti {shunt second shunt, caused the considered control system failure to be random. the diode, the first and second formers, on the main channel (pulse control combiner, outputs 01), If a malfunction in the pulse mode of operation of the driver, which are connected to the control -electrodes of the main and switching thyristors, respectively, of which are due to the fact that, in order to increase reliability, a third control pulse shaper, four delay elements, and also the first and second optocouplers, current-controlled, are introduced thirty which are connected to the control electrodes of the main and switching thyristors, respectively, about the fact that, in order to increase reliability, the third driver of control pulses, four delay elements, as well as the first and second optocouplers, were turned off operation of the switching node), then at time tt J3 the element 21 will turn out to be open, which leads to the appearance of a signal that the thyristor 2 does not turn off and the subsequent emergency shutdown of the shaping 35 resistors and elements of the privator (combination 10) Similarly, as the light emitter of the first optocoupler, considered, the element And 21 turns out to be open through the first current-limiting resistor and in the event that the failure of the torus is connected parallel to the main one in the pulse-forming mode of the thyristor, the photoreceiver of the first optocoupler RON through the first element of the delaying thyristor 7, but no longer due to connected to the inputs of the first signal loss formation in the control channel, but for example, due to the internal features of the thyristor itself (damage to the structure In this case, the element E 22 is also passed through the second current-limiting source. An autoresistor is connected in parallel with the commercial process in the circuit for shaping the thyristor, the photodetector of the last case. corresponds to the second optocoupler connected to the second combination 11 In all considered gQ inputs of the elements And and the input of the third the delay element, the output of which is connected to the input of the second control pulse generator n through the fourth delay element connected to the first, ensures that the signals pass to the second input of the second element I, the output cut elements of which 21 and 22 through the third driver The proposed device has control pulses connected to an up-to-date resistance to disturbances to the equalizing electrode of the switching pulse mode of operation associated with the thyristor. the control pulse bodies and the second delay element, the output of which is connected to the first input of the first element in violation of the pulsed mode of operation, the optocoupler I2 LED continuously emits (voltage diagram on the switching thyristor), as switching node, made in the form of a series-connected throttle, a capacitor and a switching .ti {head, shunted by a second reverse diode, the first and second control pulse shapers, outputs 25 diode, first and second control pulse shaper, outputs thirty which are connected to control electrodes of the main and switching thyristors, respectively, about the fact that, in order to increase reliability, a third driver of control pulses, four delay elements, as well as first and second optocouplers, current limiters and elements are introduced And, with the light emitter of the first optocoupler, through the first current-limiting resistor connected in parallel to the main thyristor, the photodetector of the first opt-40 Rona through the first delay element is connected to the inputs of the first Ba light emitter of the second photocoupler 45 via a second limiting resistor connected in parallel commuting thyristor, photocoupler second photodetector is connected to the second inputs of the AND gQ and the input of the third And the light emitter of the first optocoupler, and the primary resistor are connected in parallel with the main thyristor, the photoreceiver of the first opto-ron is connected through the first delay element to the inputs of the first form-emitter of the second optron through the second current-limiting resistor in parallel - to the mutating thyristor, the photodetector of the second optocoupler is connected to the second inputs of the elements And and the input of the third control pulse bodies and a second delay element, the output of which is connected to the first input of the first element .2 He8MflHJv.v7 HeebiHfla /.v2